TMB Planetary II
Posted 24 August 2010 - 06:21 AM
Posted 24 August 2010 - 02:04 PM
I have the series I eyepieces and I don't notice the problem however.
Posted 24 August 2010 - 11:45 PM
Posted 25 August 2010 - 12:39 AM
Posted 25 August 2010 - 12:52 AM
Posted 25 August 2010 - 01:54 AM
I guess I haven't use my TMB Planetaries in my fast scopes enough to recommend them in fast scopes, perhaps others are able to relate their performance in fast scopes.
Posted 25 August 2010 - 05:11 AM
Would these make a good choice for general use (not only planetary) with a fast reflector? I am thinking about the 6mm and the 9mm.
I think so. I have a mixed set of TMB Planetaris, everything but the 8mm. I also have a set of Naglers that I use as my front line eyepieces. From my backyard I often use the TMB Planetaries for DSO viewing and other than field of view, I feel I am not giving up too much.
Another inexpensive eyepiece I like, particularly for DSOs, is the 9mm Syntawide Field. It is sold by Orion as the Expanse and by Owl Astronomy... It is very similar to the TMB Planetary design but has about 10 degrees more AFoV.
Posted 25 August 2010 - 07:49 AM
(casting aside build quality differences)
Posted 25 August 2010 - 09:38 AM
Posted 25 August 2010 - 11:35 AM
I personally believe that their price, whether or not it's on sale have been a real blessing for not only beginners, but those with more time in this hobby that either can't or don't want to put in any more money. It's a SUPER price for a real EP.
Posted 25 August 2010 - 01:20 PM
The TMB II Series, see www.tmboptical.com/itemsGrid.asp?cat_id=62, show all eyepieces at 58° FOV but with varying ERs.
ER for 2.5 and 3.2mm spec'd at 14mm.
ER for 4mm spec'd at 10mm.
ER for 5, 6, 7, and 9mm spec;d at 12mm.
I have the 9mm from that original BO/TMB series and its a respectable eyepiece. Not sure if the ER differences are real or not since I don't have a Series II to compare my original series.
Posted 25 August 2010 - 09:22 PM
It had a ridged conical retaining ring for the field lens group, black tapered barrel, and the interior/spacer rings were bead blasted. It worked very well in regard to controlling stray light. I don't think the others had all these additions.
To my knowledge, only the 6mm Type II had all these features. There was a detailed review in the Eyepiece Forum with an in depth comparison with the original TMB Planetary 6mm along with photos showing the physical differences. Very long thread IIRC.
I guess its hard to tell as Burgess Optical did runs of eyepieces one focal length at a time for the most part. Each run had a little something different, like slightly different coatings, black or chrome barrels, etc.
Posted 26 August 2010 - 04:45 AM
Posted 26 August 2010 - 10:50 AM
Posted 30 August 2010 - 07:01 AM
Also, Astronomics said the eye relief for this eyepiece was 14mm (they say that they only state "usuable" eye relief). That's about what I see in the eyepiece, shure 'nuff.
Posted 30 August 2010 - 09:18 AM
Consensus from those "in the know" is that the BO/TMB Planetary, TMB Planetary, and TMB Planetary II eyepieces are all optically and internally identical with only superficial cosmetic differences.
On the TMB forum, Bill Burgess said that inside the old series is about 30 mm of surface area that can reflect
light into the optical path. In the Planetary II it's less than 0.5 mm. Also there's 4x the scratch/dig specs of the first series, and 50% reduction in coating reflections. The Planetary II's are CNC made whilst the first Series have cast bodies.
I personally can't confirm any of this as being "fact", merely that it's what Burgess stated on the TMB Forum.